package servlet;

import com.sun.net.httpserver.HttpPrincipal;

import javax.servlet.ServletException;
import javax.servlet.annotation.WebServlet;
import javax.servlet.http.HttpServlet;
import javax.servlet.http.HttpServletRequest;
import javax.servlet.http.HttpServletResponse;
import javax.servlet.http.HttpSession;
import java.io.IOException;

/**
 * @author : niu niu
 * @version : 1.0.0
 * @date : 2023/4/10 11:22
 */
@WebServlet("/logout")
public class LogoutServlet extends HttpServlet {
    @Override
    protected void doGet(HttpServletRequest req, HttpServletResponse resp) throws ServletException, IOException {
        resp.setContentType("text/html;charset=utf8");
        HttpSession session = req.getSession(false);
        if (session == null || session.getAttribute("user") == null){
            resp.getWriter().write("用户未登录,无需退出");
            return;
        }

        session.removeAttribute("user");
        resp.sendRedirect("index.html");
    }
}
